WHAT
Once the work for 3scale sts native support is complete, the docs around the workaround for creating the s3 iam credentials no longer applies.

The doc should be update to remove the workaround [1]

[1] https://access.redhat.com/documentation/en-us/red_hat_openshift_api_management/1/guide/53dfb804-2038-4545-b917-2cb01a09ef98#adding-openshift-api-management-with-sts-to-your-rosa-cluster_openshift-api-management-adding

HOW
<Suggestions for how this may be solved. [Optional]

TESTS
<List of related tests>

DONE
<bullet point items for what should be completed>